The difference between dolomite and calcium carbonate in a glaze

Wednesday 5th March 2014

These glaze cones are fired at cone 6 (without slow cooling) and have the same recipe: 20 insight-live.com/material/351">Frit 3134, 21 EP Kaolin, 27 calcium carbonate, 32 silica. The difference: The one on the left uses dolomite instead of calcium carbonate. Notice how the MgO from the dolomite mattes the surface (without slow cooling) whereas the CaO from the calcium carbonate produces a brilliant gloss (because it needs slow cooling).

Pages that reference this post in the Digitalfire Reference Library:

Calcium Carbonate, Dolomite, MgO, CaO, Calcia vs Magnesia matte - Different mechanisms, Magnesia Matte

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